1 /* 2 * Copyright (C) 2011 Luigi Rizzo. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 /* 27 * $FreeBSD$ 28 * 29 * netmap support for: re 30 * 31 * For more details on netmap support please see ixgbe_netmap.h 32 */ 33 34 35 #include <net/netmap.h> 36 #include <sys/selinfo.h> 37 #include <vm/vm.h> 38 #include <vm/pmap.h> /* vtophys ? */ 39 #include <dev/netmap/netmap_kern.h> 40 41 42 /* 43 * Register/unregister. We are already under netmap lock. 44 */ 45 static int 46 re_netmap_reg(struct netmap_adapter *na, int onoff) 47 { 48 struct ifnet *ifp = na->ifp; 49 struct rl_softc *adapter = ifp->if_softc; 50 51 RL_LOCK(adapter); 52 re_stop(adapter); /* also clears IFF_DRV_RUNNING */ 53 if (onoff) { 54 nm_set_native_flags(na); 55 } else { 56 nm_clear_native_flags(na); 57 } 58 re_init_locked(adapter); /* also enables intr */ 59 RL_UNLOCK(adapter); 60 return (ifp->if_drv_flags & IFF_DRV_RUNNING ? 0 : 1); 61 } 62 63 64 /* 65 * Reconcile kernel and user view of the transmit ring. 66 */ 67 static int 68 re_netmap_txsync(struct netmap_adapter *na, u_int ring_nr, int flags) 69 { 70 struct ifnet *ifp = na->ifp; 71 struct netmap_kring *kring = &na->tx_rings[ring_nr]; 72 struct netmap_ring *ring = kring->ring; 73 u_int nm_i; /* index into the netmap ring */ 74 u_int nic_i; /* index into the NIC ring */ 75 u_int n, new_slots; 76 u_int const lim = kring->nkr_num_slots - 1; 77 u_int const cur = nm_txsync_prologue(kring, &new_slots); 78 79 /* device-specific */ 80 struct rl_softc *sc = ifp->if_softc; 81 struct rl_txdesc *txd = sc->rl_ldata.rl_tx_desc; 82 83 if (cur > lim) /* error checking in nm_txsync_prologue() */ 84 return netmap_ring_reinit(kring); 85 86 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag, 87 sc->rl_ldata.rl_tx_list_map, 88 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); // XXX extra postwrite ? 89 90 /* 91 * First part: process new packets to send. 92 */ 93 nm_i = kring->nr_hwcur; 94 if (nm_i != cur) { /* we have new packets to send */ 95 nic_i = sc->rl_ldata.rl_tx_prodidx; 96 // XXX or netmap_idx_k2n(kring, nm_i); 97 98 for (n = 0; nm_i != cur; n++) { 99 struct netmap_slot *slot = &ring->slot[nm_i]; 100 u_int len = slot->len; 101 uint64_t paddr; 102 void *addr = PNMB(slot, &paddr); 103 104 /* device-specific */ 105 struct rl_desc *desc = &sc->rl_ldata.rl_tx_list[nic_i]; 106 int cmd = slot->len | RL_TDESC_CMD_EOF | 107 RL_TDESC_CMD_OWN | RL_TDESC_CMD_SOF ; 108 109 NM_CHECK_ADDR_LEN(addr, len); 110 111 if (nic_i == lim) /* mark end of ring */ 112 cmd |= RL_TDESC_CMD_EOR; 113 114 if (slot->flags & NS_BUF_CHANGED) { 115 /* buffer has changed, reload map */ 116 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 117 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 118 netmap_reload_map(sc->rl_ldata.rl_tx_mtag, 119 txd[nic_i].tx_dmamap, addr); 120 } 121 slot->flags &= ~(NS_REPORT | NS_BUF_CHANGED); 122 123 /* Fill the slot in the NIC ring. */ 124 desc->rl_cmdstat = htole32(cmd); 125 126 /* make sure changes to the buffer are synced */ 127 bus_dmamap_sync(sc->rl_ldata.rl_tx_mtag, 128 txd[nic_i].tx_dmamap, 129 BUS_DMASYNC_PREWRITE); 130 131 nm_i = nm_next(nm_i, lim); 132 nic_i = nm_next(nic_i, lim); 133 } 134 sc->rl_ldata.rl_tx_prodidx = nic_i; 135 /* decrease avail by # of packets sent minus previous ones */ 136 kring->nr_hwcur = cur; /* the saved ring->cur */ 137 kring->nr_hwavail -= new_slots; 138 139 /* synchronize the NIC ring */ 140 bus_dmamap_sync(sc->rl_ldata.rl_tx_list_tag, 141 sc->rl_ldata.rl_tx_list_map, 142 BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE); 143 144 /* start ? */ 145 CSR_WRITE_1(sc, sc->rl_txstart, RL_TXSTART_START); 146 } 147 148 /* 149 * Second part: reclaim buffers for completed transmissions. 150 */ 151 if (flags & NAF_FORCE_RECLAIM || kring->nr_hwavail < 1) { 152 nic_i = sc->rl_ldata.rl_tx_considx; 153 for (n = 0; nic_i != sc->rl_ldata.rl_tx_prodidx; 154 n++, nic_i = RL_TX_DESC_NXT(sc, nic_i)) { 155 uint32_t cmdstat = 156 le32toh(sc->rl_ldata.rl_tx_list[nic_i].rl_cmdstat); 157 if (cmdstat & RL_TDESC_STAT_OWN) 158 break; 159 } 160 if (n > 0) { 161 sc->rl_ldata.rl_tx_considx = nic_i; 162 sc->rl_ldata.rl_tx_free += n; 163 kring->nr_hwavail += n; 164 } 165 } 166 167 nm_txsync_finalize(kring, cur); 168 169 return 0; 170 } 171 172 173 /* 174 * Reconcile kernel and user view of the receive ring. 175 */ 176 static int 177 re_netmap_rxsync(struct netmap_adapter *na, u_int ring_nr, int flags) 178 { 179 struct ifnet *ifp = na->ifp; 180 struct netmap_kring *kring = &na->rx_rings[ring_nr]; 181 struct netmap_ring *ring = kring->ring; 182 u_int nm_i; /* index into the netmap ring */ 183 u_int nic_i; /* index into the NIC ring */ 184 u_int n, resvd; 185 u_int const lim = kring->nkr_num_slots - 1; 186 u_int const cur = nm_rxsync_prologue(kring, &resvd); /* cur + res */ 187 int force_update = (flags & NAF_FORCE_READ) || kring->nr_kflags & NKR_PENDINTR; 188 189 /* device-specific */ 190 struct rl_softc *sc = ifp->if_softc; 191 struct rl_rxdesc *rxd = sc->rl_ldata.rl_rx_desc; 192 193 if (cur > lim) 194 return netmap_ring_reinit(kring); 195 196 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag, 197 sc->rl_ldata.rl_rx_list_map, 198 BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); 199 200 /* 201 * First part: import newly received packets. 202 * 203 * This device uses all the buffers in the ring, so we need 204 * another termination condition in addition to RL_RDESC_STAT_OWN 205 * cleared (all buffers could have it cleared. The easiest one 206 * is to limit the amount of data reported up to 'lim' 207 */ 208 if (netmap_no_pendintr || force_update) { 209 uint16_t slot_flags = kring->nkr_slot_flags; 210 211 nic_i = sc->rl_ldata.rl_rx_prodidx; /* next pkt to check */ 212 nm_i = netmap_idx_n2k(kring, nic_i); 213 214 for (n = kring->nr_hwavail; n < lim ; n++) { 215 struct rl_desc *cur_rx = &sc->rl_ldata.rl_rx_list[nic_i]; 216 uint32_t rxstat = le32toh(cur_rx->rl_cmdstat); 217 uint32_t total_len; 218 219 if ((rxstat & RL_RDESC_STAT_OWN) != 0) 220 break; 221 total_len = rxstat & sc->rl_rxlenmask; 222 /* XXX subtract crc */ 223 total_len = (total_len < 4) ? 0 : total_len - 4; 224 ring->slot[nm_i].len = total_len; 225 ring->slot[nm_i].flags = slot_flags; 226 /* sync was in re_newbuf() */ 227 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 228 rxd[nic_i].rx_dmamap, BUS_DMASYNC_POSTREAD); 229 nm_i = nm_next(nm_i, lim); 230 nic_i = nm_next(nic_i, lim); 231 } 232 if (n != kring->nr_hwavail) { 233 sc->rl_ldata.rl_rx_prodidx = nic_i; 234 sc->rl_ifp->if_ipackets += n - kring->nr_hwavail; 235 kring->nr_hwavail = n; 236 } 237 kring->nr_kflags &= ~NKR_PENDINTR; 238 } 239 240 /* 241 * Second part: skip past packets that userspace has released. 242 */ 243 nm_i = kring->nr_hwcur; 244 if (nm_i != cur) { 245 nic_i = netmap_idx_k2n(kring, nm_i); 246 for (n = 0; nm_i != cur; n++) { 247 struct netmap_slot *slot = &ring->slot[nm_i]; 248 uint64_t paddr; 249 void *addr = PNMB(slot, &paddr); 250 251 struct rl_desc *desc = &sc->rl_ldata.rl_rx_list[nic_i]; 252 int cmd = NETMAP_BUF_SIZE | RL_RDESC_CMD_OWN; 253 254 if (addr == netmap_buffer_base) /* bad buf */ 255 goto ring_reset; 256 257 if (nic_i == lim) /* mark end of ring */ 258 cmd |= RL_RDESC_CMD_EOR; 259 260 if (slot->flags & NS_BUF_CHANGED) { 261 /* buffer has changed, reload map */ 262 desc->rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 263 desc->rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 264 netmap_reload_map(sc->rl_ldata.rl_rx_mtag, 265 rxd[nic_i].rx_dmamap, addr); 266 slot->flags &= ~NS_BUF_CHANGED; 267 } 268 desc->rl_cmdstat = htole32(cmd); 269 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 270 rxd[nic_i].rx_dmamap, 271 BUS_DMASYNC_PREREAD); 272 nm_i = nm_next(nm_i, lim); 273 nic_i = nm_next(nic_i, lim); 274 } 275 kring->nr_hwavail -= n; 276 kring->nr_hwcur = cur; 277 278 bus_dmamap_sync(sc->rl_ldata.rl_rx_list_tag, 279 sc->rl_ldata.rl_rx_list_map, 280 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); 281 } 282 283 /* tell userspace that there might be new packets */ 284 ring->avail = kring->nr_hwavail - resvd; 285 286 return 0; 287 288 ring_reset: 289 return netmap_ring_reinit(kring); 290 } 291 292 293 /* 294 * Additional routines to init the tx and rx rings. 295 * In other drivers we do that inline in the main code. 296 */ 297 static void 298 re_netmap_tx_init(struct rl_softc *sc) 299 { 300 struct rl_txdesc *txd; 301 struct rl_desc *desc; 302 int i, n; 303 struct netmap_adapter *na = NA(sc->rl_ifp); 304 struct netmap_slot *slot; 305 306 if (!na || !(na->na_flags & NAF_NATIVE_ON)) { 307 return; 308 } 309 310 slot = netmap_reset(na, NR_TX, 0, 0); 311 /* slot is NULL if we are not in netmap mode */ 312 if (!slot) 313 return; // XXX cannot happen 314 /* in netmap mode, overwrite addresses and maps */ 315 txd = sc->rl_ldata.rl_tx_desc; 316 desc = sc->rl_ldata.rl_tx_list; 317 n = sc->rl_ldata.rl_tx_desc_cnt; 318 319 /* l points in the netmap ring, i points in the NIC ring */ 320 for (i = 0; i < n; i++) { 321 uint64_t paddr; 322 int l = netmap_idx_n2k(&na->tx_rings[0], i); 323 void *addr = PNMB(slot + l, &paddr); 324 325 desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 326 desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 327 netmap_load_map(sc->rl_ldata.rl_tx_mtag, 328 txd[i].tx_dmamap, addr); 329 } 330 } 331 332 static void 333 re_netmap_rx_init(struct rl_softc *sc) 334 { 335 struct netmap_adapter *na = NA(sc->rl_ifp); 336 struct netmap_slot *slot = netmap_reset(na, NR_RX, 0, 0); 337 struct rl_desc *desc = sc->rl_ldata.rl_rx_list; 338 uint32_t cmdstat; 339 int i, n, max_avail; 340 341 if (!slot) 342 return; 343 n = sc->rl_ldata.rl_rx_desc_cnt; 344 /* 345 * Userspace owned hwavail packets before the reset, 346 * so the NIC that last hwavail descriptors of the ring 347 * are still owned by the driver (and keep one empty). 348 */ 349 max_avail = n - 1 - na->rx_rings[0].nr_hwavail; 350 for (i = 0; i < n; i++) { 351 void *addr; 352 uint64_t paddr; 353 int l = netmap_idx_n2k(&na->rx_rings[0], i); 354 355 addr = PNMB(slot + l, &paddr); 356 357 netmap_reload_map(sc->rl_ldata.rl_rx_mtag, 358 sc->rl_ldata.rl_rx_desc[i].rx_dmamap, addr); 359 bus_dmamap_sync(sc->rl_ldata.rl_rx_mtag, 360 sc->rl_ldata.rl_rx_desc[i].rx_dmamap, BUS_DMASYNC_PREREAD); 361 desc[i].rl_bufaddr_lo = htole32(RL_ADDR_LO(paddr)); 362 desc[i].rl_bufaddr_hi = htole32(RL_ADDR_HI(paddr)); 363 cmdstat = NETMAP_BUF_SIZE; 364 if (i == n - 1) /* mark the end of ring */ 365 cmdstat |= RL_RDESC_CMD_EOR; 366 if (i < max_avail) 367 cmdstat |= RL_RDESC_CMD_OWN; 368 desc[i].rl_cmdstat = htole32(cmdstat); 369 } 370 } 371 372 373 static void 374 re_netmap_attach(struct rl_softc *sc) 375 { 376 struct netmap_adapter na; 377 378 bzero(&na, sizeof(na)); 379 380 na.ifp = sc->rl_ifp; 381 na.na_flags = NAF_BDG_MAYSLEEP; 382 na.num_tx_desc = sc->rl_ldata.rl_tx_desc_cnt; 383 na.num_rx_desc = sc->rl_ldata.rl_rx_desc_cnt; 384 na.nm_txsync = re_netmap_txsync; 385 na.nm_rxsync = re_netmap_rxsync; 386 na.nm_register = re_netmap_reg; 387 na.num_tx_rings = na.num_rx_rings = 1; 388 netmap_attach(&na); 389 } 390 391 /* end of file */ 392